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Xenon short-arc lamp: Difference between revisions
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→Lamp Alignment
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With the lens in, the shadows will be gone and there will be a hotspot in the center of the screen. Focus the lamp (making fine X and Y axis adjustments as necessary) until no shadows are visible at the corners and the illumination is even across the screen. | With the lens in, the shadows will be gone and there will be a hotspot in the center of the screen. Focus the lamp (making fine X and Y axis adjustments as necessary) until no shadows are visible at the corners and the illumination is even across the screen. | ||
===Measuring Luminance=== | |||
When properly aligned, the brightness should be 16 [[foot lamberts]] +/- 2 at the center of the screen with no more than 25% drop off at the corners, in compliance with [[Society of Motion Picture and Television Engineers|SMPTE]] specifications. | When properly aligned, the brightness should be 16 [[foot lamberts]] +/- 2 at the center of the screen with no more than 25% drop off at the corners, in compliance with [[Society of Motion Picture and Television Engineers|SMPTE]] specifications. | ||